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External damping of power steering for a vehicle

a technology for external damping and power steering, which is applied in the direction of spring/damper functional characteristics, mechanical devices, transportation and packaging, etc., can solve the problems of reducing and reducing the noise, vibration and harshness of the power steering assembly. , to achieve the effect of reducing noise, vibration and harshness, and increasing the friction of the ball nu

Active Publication Date: 2021-04-27
TRW AUTOMOTIVE US LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0027]One or more potential and / or realized advantages of an embodiment of the power steering assembly include a reduction of noise, vibration, and harshness produced by the power steering assembly without increasing friction in the ball nut.

Problems solved by technology

For example, the components of the power steering assembly may experience lash when a direction of steering changes from left to right or right to left.
As a result, undesirable noise, vibration, and harshness is produced by the power steering assembly.
However, the mechanical means increase friction in the ball nut.
The increased friction reduces performance of the power steering assembly.
Additionally, known software control means are limited in how much lash they can reduce.

Method used

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  • External damping of power steering for a vehicle
  • External damping of power steering for a vehicle

Examples

Experimental program
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Effect test

first embodiment

[0032]Referring now to FIGS. 1 and 2, there is illustrated a power steering assembly, indicated generally at 100, for a vehicle. The power steering assembly 100 has a damper assembly, indicated generally at 102, produced in accordance with the present invention. The general structure and operation of the power steering assembly 100 is conventional in the art. For example, the power steering assembly 100 may be as disclosed by U.S. Pat. No. 7,055,646 to Bugosh, the disclosure of which is hereby incorporated by reference in entirety herein. Thus, only those portions of the power steering assembly 100 which are necessary for a full understanding of this invention will be explained and illustrated in detail. Although this invention will be described and illustrated in connection with the particular power steering assembly 100 disclosed herein, it will be appreciated that this invention may be used in connection with other types of power steering assemblies, including other electric, hyd...

second embodiment

[0047]Referring now to FIG. 3, there is illustrated a damper assembly, indicated generally at 202, produced in accordance with the present invention for use with a power steering assembly 200. Because the damper assembly 202 is a variation of the damper assembly 102 of FIGS. 1 and 2, like reference numerals, increased by 100, designate corresponding parts in the drawings and detailed description thereof will be omitted.

[0048]For the damper assembly 202, a second attachment 252 is to a ground surface 256. The ground surface 256 is a structural member of a vehicle in which the power steering assembly 200 is mounted. For example, the structural member may be a frame or body component of the vehicle. The ground surface 256 is fixed in position relative to a steering member 222 and first and second tie rods 228A and 228B, respectively, and the steering member 222 and first and second tie rods 228A and 230B, respectively, are moveable relative to the ground surface 256.

third embodiment

[0049]Referring now to FIG. 4, there is illustrated a damper assembly, indicated generally at 302, produced in accordance with the present invention for use with a power steering assembly 300. Because the damper assembly 302 is a variation of the damper assembly 102 of FIGS. 1 and 2, like reference numerals, increased by 200, designate corresponding parts in the drawings and detailed description thereof will be omitted.

[0050]The damper assembly 302 includes a damper 338 housed in a damper housing 358. The damper housing 358 is mounted, attached, or otherwise directly and rigidly secured to a steering housing 312. For example, the damper housing 358 may be formed monolithically with the steering housing 312. As such, a ground surface for the damper assembly 302 is the steering housing 312 and a second connection 342 is directly between the steering housing 312 and the damper housing 358.

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Abstract

A steering member has a rack portion and a screw portion. The steering member is in a steering housing and operatively connected to a tie rod. A pinion is operatively connected between the rack portion and a steering wheel. A ball nut is operatively connected to the screw portion. A power source is operatively connected to the ball nut. The power source drives the ball nut to effect linear movement of the steering member upon rotation of the steering wheel. A damper has a first connection to the tie rod and a second connection to a ground surface. The ground surface is fixed relative to the steering member. The damper is external to the ball nut.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This application claims priority to, and the benefit of, U.S. Provisional Application Ser. No. 62 / 325,484, filed Apr. 21, 2016, the full disclosure of which is incorporated herein by reference in entirety.BACKGROUND OF INVENTION[0002]This invention relates in general to power steering assemblies for vehicles and in particular to damping of such a power steering assembly.[0003]An automotive vehicle typically includes a power steering assembly to assist in turning steerable wheels of the vehicle. The power steering assembly may include a rack and pinion assembly to convert rotational movement of a steering wheel of the vehicle into linear movement of a steering member. The linear movement of the steering member then turns the steerable wheels. A ball nut may be mounted on the steering member and operably connected to a power source. The power source and ball nut together assist in the linear movement of the steering member in response to rot...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): B62D3/08B62D7/22F16F9/16B62D5/04
CPCB62D7/228B62D3/08F16F9/16B62D5/0448F16F2222/06F16F2222/08F16F2222/12F16F2228/066
Inventor URBACH, BRIAN A.
Owner TRW AUTOMOTIVE US LLC
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